Improvement in machines for grinding pulleys



2 Sheets--Shiee't i.

A. WOOD. Machine for Grinding Pu No.i64,897.

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Patented 1une.22, i875.

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Machine for Grinding Pulleys. NO 164,897l Patented1une22,1875.

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THE GRAPHIC C0,PHOT0 LITH.39 3x41 QARK PLACE, KAY.

Hurrah S'rn'rns PATENT IMPROVEMENT IN MACl-llNES FOR GRINDING PULLEYS..

Specification forming part of Letters Patent No. 161,897, dated June 22, 1875; application tiled December 5, 1874.

To all whom, t may concern:

Beit known thatI, AURIN WOOD, of Worcester, in the county of Worcester and State of Massachusetts, have invented a new Machine Vfor Grinding Pulleys; and I do hereby declare the following, when taken in connection with the accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specilication, and represent, iug Figure l, plan or top view, Fig. 2, front view 5 Fig. .3, end view; Fig. 4, transverse section.

This invention relates to a new method ot finishing the surface ot' pulleys. The usual method has been to turn the surface in a common engine-lathe; but to do this the rim must be cast sufiiciently thick, that the tool may take through the scale. Hence a largeA proportion of the rim is removed and wasted by this usual method. On pulleys of considerable size, or pulleys with light rims, the cutting must be very slow to prevent chattering.77

The object of this invention is to linish the surface by grinding; and the invention consists in a carriage for supporting the pulley, and in which it is made to revolve, the said carriage self-adjusting to the shape of the face of the pulley, combined with a revolving grinding wheel or stone ruiming in contact with the faceof the pulley, as more fully hereinafter described.

A is the bed, on which the base B of the carriage is arranged to move longitudinally upon suitable guides C, and caused to move to and fro on said guides by the leading-screw D, in like manner as for similarmachines. A pulley, E, is attached to the said screw, so that power may be applied to turn the screw, it desired. 0n this base the carriage-body F is arranged to move in guides L transversely across the base B, caused so to do by a screw, a, to which a hand-wheel, N, is attached, as a convenience for turning said screw. On the body F a plate, P, is pivoted, as at d, so as to turn to the right and left upon said pivot d, but resting upon the body F. On this plate are two heads, M M', the one, M, supporting a mandrel, b, carrying a face-plate, S, which is caused to revolve by the application of power thereto in any known manner, here represented as by a counter-shaft and pulley., T, geared to the said face-plate. The other head is provided with a center, substantially as the tailstock77 of a lathe. Betweenthe face-plate and the tail-stock the pulley W to be iinished is arranged substantially as inra lathe, and so as to revolve with the face-plate. In rear of' the pulley-carriage the grinding-wheel VB' is arranged upon an axis substantially parallel to the axis ot' the pulley to be ground. This wheel or stone is made to revolve by the. application ot' power thereto in the usual manner for such wheels. The pulley to be ground is arranged in the carriage, and adjusted so that the surface of the pulley and the grindingpulley, bot-h revolving, will come in contact, and in such contact the surface of the pulley will be ground andnished.

The surface of pulleys is usually made substantially segmental in longitudinal line-that is, ot' larger diameter in the center than at the ends. That this desired form may be given to the surface a transverse-sliding bar, D', is arranged in the bed, and this is connected to the body F by an arm, F', so that the transverse movement of the body and bar will be the same. The arm F' is slotted to set over a stud, a, on the bar'D'. Hence the longi tudinal movement of the carriage does not affect the bar, the slot in the bar passing freely over the stud from one extreme to the other. From the plate P a similar arm, P', extends over the bar D, the slot in this barbeing substantially of the form of the longitudinal face of the pulley to be ground. This slot works upon a stud, in, on the bar D'. As this arm P' travels longitudinally with the carriage it follows that the plate P and the pulley being ground will, in such longitudinal movement, receive an oscillating transverse movement, according to the shape of the slot, and thus present the surface of the pulley from end to end to the stone to be ground and finished to that form.

By this method of nishing pulleys I am enabled .to cast them with a very thin rim,

`and as the process of grinding requires less labor than that of turning I am enabled to finish the pulley for little, if any, more cost Prion.

than the `@unonnt of metal saved from the oldv to lthe supports M M', and a grinding-wheel..

process. B', the combination and arrangement being I elaimsubstantially such as described. The combination of a. supporting-carriage AUBIN WOOD. for the pulley, having a. longitudinal and Vitnesses: transverse movement, and a pattern, P', to JOSEPH A. HOWLAND, impart e predetermined oscillating movement OTIS WARREN.

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